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Choose your iMac model

Slot machines are Sd Slot Not Working On Imac popular worldwide for their record-breaking jackpots and exciting themes. With few rules and strategies to consider, slot games are perfect for new casino players. Try some free slot games now or discover online slots to play for real money. Do not reformat the card if this happens - even if the computer asks you to format it - because formatting will erase all of the data on the microSD card. Just try another adapter or see if any updated software drivers are available for the adapter you have.

If you're not sure which iMac you have, you can identify your iMac and then select it from the list below.

27-inch

24-inch

21.5-inch

• iMac (Retina 4K, 21.5-inch, 2019)*
• iMac (Retina 4K, 21.5-inch, 2017)*
• iMac (21.5-inch, 2017)*
• iMac (21.5 inch, Mid 2014)*
• iMac (21.5-inch, Late 2013)*
• iMac (21.5-inch, Late 2012)*

20-inch

17-inch

* Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), iMac (21.5-inch, Mid 2014), iMac (21.5-inch, 2017), iMac (Retina 4K, 21.5-inch, 2017), and iMac (Retina 4K, 21.5-inch, 2019). If the memory in one of these computers needs repair service, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help. Before you schedule an appointment, confirm that the specific Apple Authorized Service Provider offers memory upgrade services.

Memory in iMac (21.5-inch, Late 2015), and iMac (Retina 4K, 21.5-inch, Late 2015) is not upgradeable.

iMac (Retina 5K, 27-inch, 2020)

Get memory specifications for iMac (Retina 5K, 27-inch, 2020), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

For optimal memory performance, DIMMs should be the same capacity, speed, and vendor. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-21333
• Unbuffered
• Nonparity
• 260-pin
• 2666MHz DDR4 SDRAM

If you have mixed capacity DIMMs, see the install memory section for installation recommendations.

iMac (Retina 5K, 27-inch, 2019)

Get memory specifications for iMac (Retina 5K, 27-inch, 2019), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-21333
• Unbuffered
• Nonparity
• 260-pin
• 2666MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, 2017)

Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC4-2400 (19200)
• Unbuffered
• Nonparity
• 260-pin
• 2400MHz DDR4 SDRAM

iMac (Retina 5K, 27-inch, Late 2015)

Get memory specifications for iMac (Retina 5K, 27-inch, Late 2015), then learn how to install memory in this model.

Memory specifications

This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC3-14900
• Unbuffered
• Nonparity
• 204-pin
• 1867MHz DDR3 SDRAM

For these 27-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (Retina 5K, 27-inch, Mid 2015)
• iMac (Retina 5K, 27-inch, Late 2014)
• iMac (27-inch, Late 2013)
• iMac (27-inch, Late 2012)

Memory specifications

These iMac models feature Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications:

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

• PC3-12800
• Unbuffered
• Nonparity
• 204-pin
• 1600MHz DDR3 SDRAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Open the memory compartment door by pressing the small grey button located just above the AC power port:
5. The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside:
6. A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM. Locate the two levers on the right and left sides of the memory cage. Push the two levers outward to release the memory cage:
7. After the memory cage is released, pull the memory cage levers toward you, allowing access to each DIMM slot.
8. Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM. When reinstalling DIMMs, the notch must be oriented correctly or the DIMM won't fully insert:
9. Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot. When you insert a DIMM, make sure to align the notch on the DIMM to the DIMM slot. Find your model below for specific installation instructions and notch locations:
   • iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly left of the middle. If your DIMMs are mixed in capacity, minimize the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible.
     
   • iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:
   • iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:
     
   • iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:
     
10. After you install all of your DIMMs, push both memory cage levers back into the housing until they lock into place:
    
11. Replace the memory compartment door. You don't need to press the compartment door release button when replacing the compartment door.
12. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.
    

Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. This process can take 30 seconds or more, and the display of your iMac remains dark until it's finished. Make sure to let the memory initialization complete.

For these 27-inch and 21.5-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (27-inch, Mid 2011)
• iMac (21.5-inch, Mid 2011)
• iMac (27-inch, Mid 2010)
• iMac (21.5-inch, Mid 2010)
• iMac (27-inch, Late 2009)
• iMac (21.5-inch, Late 2009)

Memory specifications

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot.

Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ('Top' and 'bottom' slots refer to the orientation of the slots in the pictures below. 'Top' refers to the slots closest to the display; 'bottom' refers to the slots closest to the stand.)

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Philips screwdriver, remove the RAM access door in the bottom of your computer:
   
5. Remove the access door and set it aside.
6. Untuck the tab in the memory compartment. If you're replacing a memory module, gently pull the tab to eject any installed memory module:
   
7. Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly:
   
9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 24-inch and 20-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (24-inch, Early 2009)
• iMac (20-inch, Early 2009)
• iMac (24-inch, Early 2008)
• iMac (20-inch, Early 2008)
• iMac (24-inch Mid 2007)
• iMac (20-inch, Mid 2007)

Memory specifications

These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.

The maximum amount of random-access memory (RAM) you can install in each computer is:

You can use a 1GB or 2GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).

Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:

DIMMs with any of the following features aren't supported:

• Registers or buffers
• PLLs
• Error-correcting code (ECC)
• Parity
• Extended data out (EDO) RAM

Installing memory

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After your iMac cools down, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Philips screwdriver, remove the RAM access door in the bottom of the computer:
   
5. Remove the access door and set it aside.
6. Untuck the tab in the memory compartment. If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module:
   
7. Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
8. After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
9. Tuck the tabs above the memory DIMMs, and reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

For these 20-inch and 17-inch models

Get memory specifications for the following iMac models, then learn how to install memory in them:

• iMac (20-inch Late 2006)
• iMac (17-inch, Late 2006 CD)
• iMac (17-inch, Late 2006)
• iMac (17-inch, Mid 2006)
• iMac (20-inch, Early 2006)
• iMac (17-inch, Early 2006)

Memory specifications

For best performance, fill both memory slots, installing an equal memory module in each slot.
*iMac (Late 2006) uses a maximum of 3 GB of RAM.

Installing memory in the bottom slot

The internal components of your iMac can be warm. If you've been using your iMac, wait ten minutes after shutting it down to let the internal components cool.

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
   
5. Move the DIMM ejector clips to their fully open position:
   
6. Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM:
   
7. After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
8. Close the ejector clips:
   
9. Reinstall the memory access door:
   
10. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

Replacing memory in the top slot

After you shut down your iMac and give it time to cool, follow these steps:

1. Disconnect the power cord and all other cables from your computer.
2. Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the display.
3. Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
4. Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac and set it aside:
   
5. Pull the two levers on each side of the memory compartment to eject the memory module that's already installed:
   
6. Remove the memory module from your iMac as shown below:
   
7. Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM:
   
8. After you insert it, press the DIMM up into the slot with your thumbs. Don't use the DIMM ejector clips to push in the DIMM, as this might damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
9. Close the ejector clips:
   
10. Reinstall the memory access door:
    
11. Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.

If your iMac makes a tone after you install memory

iMac models introduced before 2017 might make a warning sound when you start up after installing or replacing memory:

• One tone, repeating every five seconds signals that no RAM is installed.
• Three successive tones, then a five-second pause (repeating) signals that RAM doesn't pass a data integrity check.

If you hear these tones, confirm that the memory you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If your Mac continues to make the tone, contact Apple Support.

Confirm that your iMac recognizes its new memory

After you install memory, you should confirm that your iMac recognizes the new RAM by choosing Apple () menu > About This Mac.

The window that appears lists the total memory, including the amount of memory that originally came with the computer plus the newly added memory. If all the memory in the iMac has been replaced, it lists the new total of all installed RAM.

For detailed information about the memory installed in your iMac, click System Report. Then choose Memory under the Hardware section in the left side of System Information.

If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the RAM you installed is compatible with your iMac and that it's installed correctly by reseating the memory. If you continue to have issues with the memory in your iMac, contact Apple Support.

Dec 03, 2020 • Filed to: SD Card Solutions • Proven solutions

If it is your first time experiencing your SD card not showing up on your Mac, you are probably panic-stricken. My advice, relax and read on.

The SD card errors can result from minor factors, such as dust, any other substance coating the contact points, or imperfect insertion into the slot. These are usually the first areas to address before you even get worried.

There are also other causes surrounding the issue of your SD card not showing up on Mac. How can we fix this issue? Or How to solve the device not support the SD card? Let’s together find the solutions.

First. Check and Open SD Card on Mac

So, you have your SD card at hand, and you are stuck as the SD is not reading. Well, first things first, check on the following:

Step 1. Examine your SD card physically.

Check that there is no damage, i.e., scratches on the shiny contact points or greasy coatings of any kind like food substances, dust or mud.

Clean your SD card with a clean and soft dry cloth. Do it thoroughly, especially on the corners around the contact points. However, don’t use water or lick the fabric with saliva. The moisture can destroy it when you insert it to the device.

Step 2. Insert the SD card to the Mac computer.

To avoid write protection, make sure the switch on the side is on.

The slot is usually thin and wide. To embed, make sure the contact points are facing down, and they should go in first.

Push in the SD card on your Mac. You will hear a sound produced if it is insecure. It holds the card so that it doesn’t slip out.

Step 3. Go to disk utility to check if Mac detects it.

For that, type disk utility in the spotlight. Click on the icon on the right or go through /applications/utilities/.

If you’d like to see it on the desktop, change preferences on Finder Preferences. Under the General tab, select External disks. Do the same under the sidebar tab.

After the steps, you can now open the SD card and access the contents through the Finder app. Enter into the SD card folder. On the right pane, contents get displayed.

However, if the above processes don’t work for you and your SD card is not reading, take a look at the next part.

Second. Fix SD Card Not Showing Up or Reading on Mac

Like every other advanced piece of technology, the SD card is bound to be affected by inevitable glitches in one way or another.

In reality, many technical reasons are associated with your SD card not showing up on your Mac.

Damage to the SD card reader slot.

It can be very frustrating because the damage might be too small even to notice. So how would you know? You can try inserting your SD card into another machine and see if it responds.

The operating system errors.

If your OS prevents your SD card from being recognized, reinstall it and try restarting your Mac. It should generally solve the issue for you.

Viral infection of the SD card

A virus can most likely affect your SD card if you share it with several people, especially Windows users with no virus protection. Viruses are dangerous.

An unsupported SD card format.

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Your SD card should conform to SD 1.x, 2.x, and 3.x standards for it to work. To investigate this, check out your SD card’s manufacturer website. There are also file systems that your macOS version might not support.

The Corruption of your SD card firmware.

If your SD card gets corrupted, how would you know? You can check if your SD card has the signs as follows.

• A black screen appears, displaying the error 'SD card is not accessible. The file or directory is corrupted or unreadable'.
• Most of the contents in your SD card are missing.
• An error message 'Read/Write error on SD card' appears. You can't open any folders.
• Materials on your SD card are visible, but you can’t copy them.
• When you are trying to access your images or files, an error message 'memory card error' pops up.
• The SD card has been recognized, but is blank on your computer, even though you had data stored in it.

Considering the issues mentioned above, how can you repair a corrupted SD card or perform any other fix? Looking at some of the possible solutions, they include:

Method 1. Restarting your Mac

There are three ways of doing so:

Step 1. Click on the Apple icon and choosing to restart on its menu.

Step 2. Press the Power button and on the dialog box that appears, click on 'Restart'.

Step 3. Simultaneously hold on Control + Command + Eject/Power button. It is the most reliable option, as it’s not dependent on the OS.

After that, try inserting your SD card once again. With this method, most people can find their SD card recognized on Mac now. If not, you need other solutions.

Method 2. Mounting your SD card in Disk utility

Even after modifying your Mac preferences, your SD card might still not be visible on the desktop. It means it’s only visible from the disk utility, thus not mounted.

Step 1. You can access Disk Utility through the spotlight. Simply type it on the search box or use the shortcut command + space.

Step 2. On the left pane, select your SD card. The right side of the screen will display the details.

Step 3. On the top sections towards the right is the mount option. If mounted, there will be an option of unmounting. Click on it to mount your SD card.

Method 3. Perform a First Aid check on your SD card

The First Aid check on Disk Utility is complete when you suspect something could be wrong with your SD card or any other external disk plugged in on your Mac.

Step 1. Go to Disk Utility.

Step 2. Select your SD card from the left pane.

Step 3. On the top options, First Aid is on the far left, click on it.

Step 4. Disk Utility performs a check on the partitions to verify its contents.

If the SD is going to fail, Disk Utility will inform you, and you should perform a backup before it’s too late.

Method 4. Repair your SD card

Perform a repair on your SD card if it did not mount successfully.

Step 1. Through Applications > Utilities open Disk Utilities.

Step 2. Select your SD card from the sidebar.

Step 3. On the details pane, click on the First Aid at the top and wait for the repair process until it completes.

Step 4. When complete, a drop-down sheet displays detailed information. Select the Repair Disk option on the bottom right.

In some cases, Disk Utility might fail to repair your SD card. In such a case, it will warn you of failure so you can make a backup.

Method 5. Repair Disk Permissions

As from MacOS X Yosemite and earlier, you can perform a repair of disk permissions on your start-up disk. You should do this because your internal hard disk permissions could in some ways be hindering your SD card from reading.

Step 1. Launch Disk Utility and select your Hard Disk from the sidebar.

Step 2. On the details pane, click on First Aid.

Step 3. Under the drop-down sheet, on the left bottom side, click on 'Repair Disk Permissions'.

Method 6. Format your SD card

The option to format your SD card certainly sounds scary. However, do not be dismayed. Formatting your device, even though you may not have been able to perform a backup, is not the end for you. The article later addresses a means to recover files.

Step 1. Go to the Utility Disk. After selecting your drive, click on 'Erase' at the top.

Step 2. Disk Utility will choose a format for you. You can also select your preference, depending on how you plan to use the SD card.

Step 3. You are required to name the drive. Let it be a memorable name.

Step 4. On the security options, move the slider to where it is least secure to allow you to recover any lost files. It is also the fastest way of performing the erase.

After that, click on the erase button on the bottom right. When erasing is complete, you can now make the recovery of your files.

Third. Learn What SD Card for Mac Is and How It Works?

If you are still wondering how the SD card works, then you are in the right place. The SD card is a nifty little device that can pack a tone of storage capacities of more than 1 TB.

With an SD card adapter used together with a microSD card, it gives you the flexibility to also access files it may have from any other source.

But what does SD stand for? It stands for Secure Digital, a standard that describes non-volatile memory. Mac computers come with the SD card slot, also known as Secure Digital or Secure Digital Extended Capacity (SDXC) card slot through which you can insert your SD card.

So, there are formats and standards discussed above. Also, the SD card slot has its measures such as:

• The SDXC standard that supports 4GB to 2TB in capacity.
• MMC standard.
• The UHS-II standard supports up to 2TB that’s only available to iMac pro.
• The SDHC (Secure Digital High Capacity) standard supporting 4 to 32 GB.
• The average SD supports 4MB to 2GB.

You can use these cards with adapters that conform to the specified physical standard.

All these storage media use specified file systems for them to store data. File systems store data in a breakdown of various clusters, depending on the type of file system.

The most known file system is the FAT32 format. It is available up to 32GB in capacity. For media that exceeds this, uses the exFAT file system. Cards of smaller sizes utilize the FAT16 file system.

Last. Recover Lost Data from SD Card on Mac

In this case, formatting is one method of restoring your SD card functionality, but you probably can't view the files or have no backup and thus data gets lost. Here Recoverit comes in.

Recoverit Data Recovery software is an efficient software in the recovery of files from your SD card on Mac.

• With precision, it lets you select the file format types as you like.
• Preview files before you save a batch of data onto the desired location.
• When scanning for images, it offers a sneak preview of images, videos, and documents in a larger window.
• The files you recover are usually intact. Also, it can retrieve raw data.
• Recovered files come with their original names and paths.

Step 1. Find and select your SD card from the Mac drives displayed on the screen.

Step 2. Click on Start for the software to begin scanning files.

Step 3. The preview window helps you get a sneak peek of your data. You can choose your preferred files if you don't want to recover everything. Finally, press the Recover button on the bottom right of the interface.

You also have the option of doing a deep scan of the files at the bottom.

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The process of troubleshooting an SD card can seem tedious, but it is enriching. Furthermore, the steps might seem much at first as this article goes out of its way to give extra details, but the information will always be useful in the longer run.

In case files are not visible on your SD card, don’t panic if you have no backups. It is a common characteristic of an SD card that can’t read data. Just follow the instructions, and an option to recover lost files will be available.

Lastly, if this article has been of any help to you, please don’t forget to share it widely with everyone.

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